Bibliography 193 



19. PARKINSON and SMITH. Impurities of Agricultural Seed. Headley 



Brothers, Bishopsgate, E.G. 



20. PARNELL. British Grasses. London, 1845. 



21. SINCLAIR. Hortus gramineus Woburnensis. London, 1824. 



22. SMITH, WM. G. and. CRAMPTON, C. B. Grassland in Britain. Journal 



of Agric. Science. Vol. iv, 1911-12, p. 1. 



23. SOMERVILLE, W. Influence on the Production of Mutton of Manures 



applied to Pasture. Journal Board of Agric. Vol. xvn, 1911. Sup- 

 plement. 



24. Accumulated Fertility in Grass Land in consequence of Phosphatic 

 Manuring. Journal Board of Agric. Vol. xxi, 1914, p. 481, 



25. SOWERBY'S English Botany, 1872. Vol. xi. 



26. STAPLEDON, R. G. Pasture Problems: Drought Resistance. Journal of 



Agric. Science. Vol. v, 1912-13, p. 129. 



27. Pasture Problems: The Response of Individual Species under 

 Manures. Journal of Agric. Science. Vol. vi, 1914, p. 499. 



28. STAPLEDON, R. G. and JENKIN, T. J. Pasture Problems: Indigenous 



Plants in relation to- Habitat and Sown Species. Journal of Agric. 

 Science. Vol. vni, 1916, p. 26. 



29. STAPLEDON, R. G. Grass Land and Ploughed Land. Journal Board of 



Agric. Vol. xxiv, 1917. Supplement. 



30. STEBLER and SCHROTER. The Best Forage Plants. London, 1889. 



31. SUTTON. Permanent and Temporary Pastures. London, 1902. 



32. TANSLEY, A. G. Types of British Vegetation. Camb. Univ. Press, 1911. 



33. TURNER, F. Australian Grasses. Sydney, 1895. 



34. WARD, H. M. Grasses. Camb. Univ. Press, 1901. 



35. WINTON. The Microscopy of Vegetable Foods. New York, 1906. 



13 



